Shuttle for sewing-machines



N Md l.) 4 e W. A. POLMATBBR.

SHUTTLE FOR SEWING MACHINES* Patented Deo. 241889 Nv PEYERS,Phomumugmplmr. wnshingwn. n. t:A

UNITEDV STATES PATENT Crimen.

IVILLIAM A. POLMATEER, OF JOHNSTOlVN, NEW YORK.

SHUTTLE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 418,057', datedDecember 24, 1889.

Application filed September 1887- Serial No. 250,225. (No model.)

To @ZZ whom t may concern:

Be it known that I, WILLIAM A. POLMA- TEER, of Johnstown, in the countyof Fulton and Stat-e of New York, have invented certain Improvements inSewing-Machines, of which the following is a specification.

My invention has reference to the manner of sustaining and guiding theshuttle, and is applicable alike to oscillating-rotating, andreciprocating shuttles.

The aim of the invention is to lessen the noise and friction of theworking parts, and to enable the needle thread to pass more readilyaround the shuttle.

In sewing-machines as most commonly constructed the shuttle slides atits under side on the surface of a supporting race or guide in suchmanner that the needle-thread in passing beneath the shuttle issubjected to its entire Weight. In many cases the shuttle is supportedby a horizontal rod on one side traveling ina slot in the vertical faceof a guide.

My improvement consists, essentially, in suspending the shuttle from itsupper edge by a guide or guides at the side in the manner hereinafterexplained, so that the shuttle is relieved from friction on the underside and prevented from bearing either vertically or laterally againstthe thread with objec, tionable pressure.

As my improvement is applicable to machines which are in all otherrespects of ordinary construction, I have deemed it sufficient toillustrate in the drawings the shuttle and its support.

In the accompanying drawings, Figure l is a side view of an oscillatingshuttle and its support having my improvement applied thereto. Fig. 2 isa vertical cross-section of the same on the line l l. Fig. 3 is ahorizontal section on ,the line 2 2. Fig. 4- is a side View of theshuttle. Fig.5 is a cross-section of the same on the line 3 3. Figs. 6and 7 are face views of the inner Walls of the race or guide. Figs. 8and 9 are crosssections through one edge of the race in modified forms.Fig. l0 is a cross-section illustrating the mode of suspending theshuttleV by rollers instead of stationary rods.

Referring lto Figs. 1 to 9, A represents an oscillating shuttle of aform at present in common use and familiar to every person skilled inthe art, and B a circular race or guide having a central opening toreceive the shuttle and engage its peripheral edge. My improved shuttlediffers fromthose now in use simply in having its side faces providedwith grooves or channels a., located near and following the line of theouter edge or periphery. The race, instead of being constructed to bearagainst the under edge of the shuttle to give the same support, isprovided, as shown in the several ligures, with ribs b, extending intothe grooves in the opposite sides of the shuttle. These ribs are curvedto conform to the required path of movement of the shuttle, and areadapted, as shown, to serve as the sole support of the shuttle. As theshuttle shown in the drawings oscillates in a circular path, the ribsand grooves have a circular curvature.

The race, in the form represented in the drawings, consists of the twovertical parallel plates c and d, suitably separated at the bottom by aprojection c on the former, and fastened firmly together by means ofscrews e. At the upper edge, at the pointthrough which the needle-threadWill enter, the flanges bare removed, as shown in Figs. 6 and 7, inorder that there may be no interference with the thread. I prefer toconstruct the plates c and CZ, as shown in the drawings, in such manneras to leave an entirely open space behind or outside the shuttle inorder to permit the free escape of dust, lint, and other obstructivematters, and prevent them from being held in contact with the peripheryof the shuttle; but when preferred the race may be closed around theperiphery of the shuttle, as shown in Fig. 8. y

The supportingribs may be continued entirely around the race, or theymaybe formed only at the upper portion of the same, the only requirementbeing that they shall be of such length and size as to suspend theshuttle at all times when in an operative position.

It will be observed that under my construction the outer edge of theshuttle is entirely relieved from Wear and friction, and that during theupper portion of its movement, and While the needle-thread is passingthereunder, the shuttle will hang in a pendent position from thesupporting-ribs at the top.

In Fig. 9 I have represented the ribs as formed on the sides of theshuttle to enter grooves formed in the side Walls of the race.

In Fig. 10 I have represented the shuttle as suspended at its upper edgeby anti-friction ro11ers,Which for this purpose are the equivalents ofthe supporting-ribs.

Having thus described my invention, what I claim is- 1. In asewing-machine, a stationary shuttle-guide, in combination with amovable shuttle mounted at its upper'edge on the guide and suspendedtherefrom, whereby the body of the shuttle is relieved from Wear andfriction on the side faces and bottom.

2. A shuttle having its upper edge providedv at opposite sides withguides, in combination with the stationary shuttle-race provided withcorresponding` guides at the top, said parts constructed and combined,substantially as described, to suspend the shuttle from its upper edge.In testimony whereof I hereunto set my hand, this 7th day of September,1887, in the presence of tWo attesting witn esses.

-WILLIAM A. POLMATEER. Witnesses:

F. E. MOYER, ANDREW J. NELLIs.

